仿微信右上角弹出PopupWindow

import android.app.Activity;
import android.content.Context;
import android.graphics.drawable.ColorDrawable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.widget.PopupWindow;

/**
* 仿微信右上角弹出PopupWindow CREATE BY WANGJINCHENG IN 2016-08-29
*/

public class MyPopWindow extends PopupWindow implements OnClickListener
{
private View conentView;

public MyPopWindow(final Activity context)
{
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
conentView = inflater.inflate(R.layout.begin_order_popup, null);

// DisplayMetrics dm = new DisplayMetrics();// 取得窗口属性
// context.getWindowManager().getDefaultDisplay().getMetrics(dm);
// int screenHeight = dm.heightPixels;// 窗口高度
// int screenWidth = dm.widthPixels;// 窗口的宽度

this.setContentView(conentView);// 设置PopupWindow的View
this.setWidth(LayoutParams.WRAP_CONTENT);// 设置PopupWindow弹出窗体的宽
this.setHeight(LayoutParams.WRAP_CONTENT);// 设置PopupWindow弹出窗体的高
this.setFocusable(true);// 设置PopupWindow弹出窗体可点击
this.setOutsideTouchable(true);// 设置PopupWindow其他空白区域可点击
this.update();// 刷新状态
ColorDrawable dw = new ColorDrawable(0000000000);// 实例化一个ColorDrawable颜色为半透明
this.setBackgroundDrawable(dw);// 点back键和其他地方使其消失,设置了这个才能触发OnDismisslistener,设置其他控件变化等操作

conentView.findViewById(R.id.begin_cancel_order).setOnClickListener(this);
conentView.findViewById(R.id.begin_assignment_order).setOnClickListener(this);
conentView.findViewById(R.id.begin_contact).setOnClickListener(this);
conentView.findViewById(R.id.begin_same_driver).setOnClickListener(this);
}

/**
* 显示PopupWindow
*
* @param parent
*/
public void showPopupWindow(View parent)
{
if (!this.isShowing())
{
// 以下拉方式显示popupwindow
this.showAsDropDown(parent, parent.getLayoutParams().width / 2, 0);
} else
{
this.dismiss();
}
}

@Override
public void onClick(View v)
{
switch (v.getId())
{
case R.id.begin_cancel_order:
MyPopWindow.this.dismiss();
break;
case R.id.begin_assignment_order:
MyPopWindow.this.dismiss();
break;
case R.id.begin_contact:
MyPopWindow.this.dismiss();
break;
case R.id.begin_same_driver:
MyPopWindow.this.dismiss();
break;
default:
break;
}
}
}

在main里面点击的按钮写这两行
MyPopWindow popWindow = new MyPopWindow(this);
popWindow.showPopupWindow(findViewById(R.id.begin_menu));

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